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Publication numberUS6478095 B2
Publication typeGrant
Application numberUS 09/882,982
Publication dateNov 12, 2002
Filing dateJun 15, 2001
Priority dateJun 16, 2000
Fee statusPaid
Also published asCN1186172C, CN1329973A, DE10029728A1, DE50108137D1, EP1163980A2, EP1163980A3, EP1163980B1, US20010052417
Publication number09882982, 882982, US 6478095 B2, US 6478095B2, US-B2-6478095, US6478095 B2, US6478095B2
InventorsAnton Neumaier
Original AssigneeHilti Aktiengesellschaft
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Hand-held power tool
US 6478095 B2
Abstract
A hand-held tool with more than two modes of operation and including a clutch pusher (4) at least partially located in the tool housing and fixedly connected with a bevel gear engaging a bevel gear (9) supported on the drive spindle (3), and at least one engagement cam (6) which connects the clutch pusher (4) with driving gears (11) with a possibility of axial displacement of the clutch pusher relative thereto in the first and second modes of operation, with the spindle, in the third mode of operation, being stopped without a possibility of rotation relative to the tool housing, and with the engagement cam (6) engaging in a recess (7) provided in the housing.
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Claims(4)
What is claimed is:
1. A hand-held power tool with at least three switchable modes of operation, comprising a housing (5); a tool spindle (3) located in the housing and provided with a first bevel pinion (9) supported thereon; a clutch pusher (4) at least partially located in the housing and fixedly connected with a second bevel gear (10) for joint rotation therewith, the second bevel gear (10) engaging the first bevel gear (9); and at least one engagement cam (6) for connecting the clutch pusher (4) with driving gears (11) for joint rotation therewith with a possibility of axial displacement relative thereto in first and second modes of operation, which is obtained by displacement of the clutch pusher (4), wherein, in a third mode of operation, the spindle (3) is stopped without a possibility of rotation relative to the housing, and the engagement cam (6) engages in a recess (7) provided in the housing,
wherein the tool has a fourth mode of operation, in which the spindle (3) is freely rotatable, and the engagement cam (7) rotates in a free space (8), and
wherein a switch positions, which corresponds to the fourth mode of operation is located between switch positions corresponding to the second and third modes of operation.
2. A hand-held power tool according to claim 1, wherein the first and second modes of operation are associated with different rotational speeds.
3. A hand-held power tool according to claim 1, wherein the recess (7) is formed in a stop sleeve (12) fixedly secured in the housing.
4. A hand-held power tool according to claim 1, further comprising a mode selector switch for axially displacing the clutch pusher (4) between the different switchable positions corresponding to the different modes of operation.
Description
BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a hand-held power tool such as, e.g., a combination hammer, having more than two different modes of operation.

2. Description of the Prior Art

A multi-purpose or combination hammer has, in addition to a rotary drive for producing a rotational movement, another drive, e.g., a percussion drive.

In one of the operational modes of the combination hammer, the rotary drive is separated from the working tool-receiving spindle, with the spindle being secured to hammer housing without a possibility of rotation relative to the housing.

German Publication DE 27 28 961 discloses a combination hand-held power tool which has a change-over clutch displaceable along the spindle and connected with the spindle for joint rotation therewith. The change-over clutch is displaced with a mode selector switch and has one of its end faces connectable with a pinion of the power tool drive and the other of its end faces connectable with a pinion secured to the tool housing. In the later case, the spindle becomes connected with the housing without a possibility of rotation relative thereto.

German Publication DE 19 38 660 discloses a hammer drill provided with a clutch pusher, which extends transverse to the tool spindle and which is displaced by a mode selector switch for changing the rotational speed of the spindle. An engagement cam, which is formed as a pin and is associated with the clutch pusher, connects alternatively, upon displacement of the clutch pusher, two different, step-forming, pinions of the tool drive with a bevel pinion that engages a pinion supported on the tool spindle. A fixed connection of the spindle with the housing without possibility of rotation relative thereto does not find any application in the hammer drill.

Each of the above-discussed publication discloses a hand-held power tool with two modes of operation.

Accordingly, an object of the present invention is to provide a hand-held power tool with more than two modes of operation which can be easily realized.

SUMMARY OF THE INVENTION

This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing a hand-held power tool having at least three modes of operation and including a clutch pusher at least partially located in the tool housing and fixedly connected with a bevel gear for joint rotation therewith, with the bevel gear engaging a bevel gear supported on the drive spindle. The tool includes at least one engagement cam connecting the clutch pusher with driving gears for joint rotation therewith, with a possibility of axial displacement of the clutch pusher relative thereto, in the first and second modes of operation. According to the present invention, in the third mode of operation, which is obtained by displacement of the clutch pusher, the spindle is stopped without a possibility of rotation relative to the housing with the engagement cam engaging in a recess provided in the housing. Advantageously, the hand-held power tool has a fourth mode of operation in which the clutch pusher occupies a position in which the engagement cam rotates in a free space, with the spindle being freely rotatable.

Advantageously, the fourth position of the clutch pusher, which corresponds to the fourth mode of operation, is located between the second and third positions thereof.

Advantageously, the first and second positions of the clutch pusher correspond to first and second modes of operation in which the spindle rotates with two different rotational speeds.

The novel features of the present invention, which are considered as characteristic for the invention, are set forth in the appended claims. The invention itself, however, both as to is construction and its mode of operation, together with additional advantages and objects thereof, will be best understood from the following detailed description of preferred embodiments when read with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The drawings show:

FIG. 1 a cross-sectional view of a drive unit according to the present invention for a hand-held power tool; and

FIG. 2 a cross-sectional view of portion of the drive unit shown in FIG. 1.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

A drive unit or drive 1 according to the present invention for a hand-held power tool, and which is shown in FIG. 1, has several modes of operation 2 for producing a rotational and percussion movement of a tool spindle 3. In addition to a primary first mode of operation, the drive 1 has second, third, and fourth modes of operation 2 a, 2 b and 2 c. A mode selector switch (not shown) controls shifting of a clutch pusher 4 of a multi-purpose hand-held power tool between the different modes of operation. In the third mode of operation 2 b, the tool spindle 3 is fixedly secured with respect to the housing 5, and an operating pin, which is formed as an engagement cam 6, engages, without a possibility of rotation, in its switch position corresponding to the third mode of operation 2 b, in a housing-side section recess 7. In its switch position corresponding to a fourth mode of operation 2 c, which is provided between the switch positions corresponding to the second and third modes of operation, the rotatable engagement cam 6 is surrounded by a free space 8. The clutch pusher 4 is arranged transverse to the tool spindle 3 and is connected with a bevel pinion 10 for joint rotation therewith. The bevel pinion 10 cooperates with a pinion 9 provided on the tool spindle 3. The engagement cam 6 connects the clutch pusher 4 with driving gears 11, which are offset relative to each other, forming a step, for joint rotation therewith. The clutch pusher 4 is axially displaceable relative to the driving gears 11. The gears 11 have different rotational speeds in the first and second modes of operation.

As shown in FIG. 2, sector recesses 7 are formed in a retention sleeve 12 in which the clutch pusher 4 is received and which is form lockingly secured in a housing 5. The section recesses 7 are formed diametrically opposite each other.

Though the present invention was shown and described with references to the preferred embodiments, such are merely illustrative of the present invention and are not to be construed as a limitation thereof, and various modifications of the present invention will be apparent to those skilled in the art. It is, therefore, not intended that the present invention be limited to the disclosed embodiments or details thereof, and the present invention includes all variations and/or alternative embodiment within the spirit and scope of the present invention as defined by the appended claims.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3828865 *Jul 29, 1970Aug 13, 1974Metabowerke KgHammer drill
US4236588 *Jun 8, 1978Dec 2, 1980Hilti AktiengesellschaftHammer drill with a lockable tool holder
US4971156 *Aug 31, 1989Nov 20, 1990Jason WongMulti-section controlled auxiliary fittings to be attached to a wrench
US6015017 *Apr 15, 1998Jan 18, 2000Black & Decker Inc.Rotary hammer
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6705410 *Jan 23, 2002Mar 16, 2004Hilti AktiengesellschaftElectrical hand-held power tool with a safety clutch
US7174969May 14, 2004Feb 13, 2007Black & Decker Inc.Rotary hammer
US7296635Jun 25, 2003Nov 20, 2007Black & Decker Inc.Rotary hammer with mode change ring
US7303026 *May 23, 2005Dec 4, 2007Robert Bosch GmbhHand power tool, in particular drill hammer and/or jackhammer
US7306049Dec 21, 2005Dec 11, 2007Black & Decker Inc.Mode change switch for power tool
US7334647 *Jun 9, 2006Feb 26, 2008Black & Decker Inc.Rotary tool
US7410007Sep 13, 2005Aug 12, 2008Eastway Fair Company LimitedImpact rotary tool with drill mode
US7422075 *Dec 26, 2007Sep 9, 2008Black & Decker Inc.Rotary tool
US7523791 *Jan 29, 2007Apr 28, 2009Makita CorporationImpact power tool
US8087474 *Feb 22, 2008Jan 3, 2012Makita CorporationHammer drill
US8122971Sep 23, 2010Feb 28, 2012Techtronic Power Tools Technology LimitedImpact rotary tool with drill mode
US8122972Dec 29, 2005Feb 28, 2012Black & Decker Inc.Drive mechanism for a power tool
US20120037387 *Aug 4, 2011Feb 16, 2012Chervon (Hk) LimitedElectric tool
Classifications
U.S. Classification173/48, 173/201
International ClassificationB23B45/16, B25D16/00
Cooperative ClassificationB25D2211/003, B25D16/006, B25D2211/068, B25D2216/0046
European ClassificationB25D16/00M
Legal Events
DateCodeEventDescription
Apr 16, 2014FPAYFee payment
Year of fee payment: 12
May 3, 2010FPAYFee payment
Year of fee payment: 8
Apr 14, 2006FPAYFee payment
Year of fee payment: 4
Jun 15, 2001ASAssignment
Owner name: HILTI AKTIENGESELLSCHAFT, LIECHTENSTEIN
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NEUMAIER, ANTON;REEL/FRAME:011918/0615
Effective date: 20010503
Owner name: HILTI AKTIENGESELLSCHAFT FL-9494 SCHAAN LIECHTENST
Owner name: HILTI AKTIENGESELLSCHAFTFL-9494 SCHAAN, (1) /AE
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NEUMAIER, ANTON /AR;REEL/FRAME:011918/0615